This is a neat little supplement for adding Augmented Reality tech into your modern or near-future Savage Worlds settings. I found it to be a little wordier and more dense than necessary, but it'll be easy to copy-paste what you need into your own setting doc. There's some useful GM advice for incoporating descriptions of AR into your game as well. It probably wouldn't be hard at all to add this stuff into a Sprawlrunners game.

A very useful supplement that gives you exactly what it promises. If you were curious enough about Lock and Key to read a review, then it's probably something you can use in your games.

Long story made short: if you're thinking about buying Big Apple Sewer Samurai because of any reason related to your appreciation for TMNT or other Saturday morning action cartoons, just buy it already. It really is everything you'd want from a toolkit for running TMNT-style RPG games in Savage Worlds. And then some.